FR2456977A1 - DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM - Google Patents

DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM

Info

Publication number
FR2456977A1
FR2456977A1 FR8010590A FR8010590A FR2456977A1 FR 2456977 A1 FR2456977 A1 FR 2456977A1 FR 8010590 A FR8010590 A FR 8010590A FR 8010590 A FR8010590 A FR 8010590A FR 2456977 A1 FR2456977 A1 FR 2456977A1
Authority
FR
France
Prior art keywords
digital information
offset register
medium
writing
writing digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8010590A
Other languages
French (fr)
Other versions
FR2456977B1 (en
Inventor
Donald J Rathbun
Peter P Campbell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull HN Information Systems Italia SpA
Bull HN Information Systems Inc
Original Assignee
Honeywell Information Systems Italia SpA
Honeywell Information Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Information Systems Italia SpA, Honeywell Information Systems Inc filed Critical Honeywell Information Systems Italia SpA
Publication of FR2456977A1 publication Critical patent/FR2456977A1/en
Application granted granted Critical
Publication of FR2456977B1 publication Critical patent/FR2456977B1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Dc Digital Transmission (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

L'INVENTION CONCERNE UN DISPOSITIF POUR ECRIRE DES INFORMATIONS NUMERIQUES SUR UN SUPPORT, EN MODULATION DE FREQUENCE. CE DISPOSITIF COMPREND UNE MEMOIRE-TAMPON 30, 32, POUR MEMORISER LES INFORMATIONS NUMERIQUES, UN PREMIER REGISTRE A DECALAGE 38 RELIE A LA MEMOIRE-TAMPON, UNE MEMOIRE MORTE 60, 62 RELIEE AU PREMIER REGISTRE A DECALAGE ET PRODUISANT DES SIGNAUX D'HORLOGE ET DES SIGNAUX DE DONNEES, EN REPONSE AUX SIGNAUX DE SORTIES PARALLELES DU PREMIER REGISTRE A DECALAGE, ET UN SECOND REGISTRE A DECALAGE RELIE A LA MEMOIRE MORTE POUR PRODUIRE LES INFORMATIONS NUMERIQUES A ECRIRE SUR LE SUPPORT. APPLICATION A L'INSCRIPTION D'INFORMATIONS NUMERIQUES SUR UN SUPPORT MAGNETIQUE.THE INVENTION RELATES TO A DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM, IN FREQUENCY MODULATION. THIS DEVICE INCLUDES A BUFFER MEMORY 30, 32, FOR STORING THE NUMERICAL INFORMATION, A FIRST OFFSET REGISTER 38 LINKED TO THE BUFFER MEMORY, A DEAD MEMORY 60, 62 LINKED TO THE FIRST OFFSET REGISTER AND PRODUCING CLOCK SIGNALS AND DATA SIGNALS, IN RESPONSE TO THE PARALLEL OUTPUT SIGNALS OF THE FIRST OFFSET REGISTER, AND A SECOND OFFSET REGISTER CONNECTED TO THE DEAD MEMORY TO PRODUCE THE DIGITAL INFORMATION TO BE WRITTEN ON THE MEDIA. APPLICATION TO THE WRITING OF DIGITAL INFORMATION ON A MAGNETIC SUPPORT.

FR8010590A 1979-05-14 1980-05-12 DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM Expired FR2456977B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/039,054 US4245263A (en) 1979-05-14 1979-05-14 Write precompensation and write encoding for FM and MFM recording

Publications (2)

Publication Number Publication Date
FR2456977A1 true FR2456977A1 (en) 1980-12-12
FR2456977B1 FR2456977B1 (en) 1987-03-20

Family

ID=21903415

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8010590A Expired FR2456977B1 (en) 1979-05-14 1980-05-12 DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM

Country Status (7)

Country Link
US (1) US4245263A (en)
JP (1) JPS55153115A (en)
AU (1) AU546005B2 (en)
CA (1) CA1172767A (en)
DE (1) DE3018027A1 (en)
FR (1) FR2456977B1 (en)
GB (1) GB2049369B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS563421A (en) * 1979-06-21 1981-01-14 Canon Inc Signal converting device
US4398225A (en) * 1981-04-24 1983-08-09 Iomega Corporation Combined serializer encoder and decoder for data storage system
US4506252A (en) * 1981-05-05 1985-03-19 Sperry Corporation Ternary data encoding system
JPS5876315A (en) * 1981-10-29 1983-05-09 Mazda Motor Corp Strut type suspension for car
JPS58141410A (en) * 1982-02-17 1983-08-22 Usac Electronics Ind Co Ltd Bit shift compensating write circuit of magnetic recording device
US4635141A (en) * 1982-10-13 1987-01-06 United States Design Corporation Method and apparatus for storing data on magnetic or optical media
JPS5977607A (en) * 1982-10-27 1984-05-04 Hitachi Ltd Compensating method of recording timing
US4731738A (en) * 1983-02-14 1988-03-15 Honeywell Information Systems Inc. Memory timing and control apparatus
US4544963A (en) * 1984-01-16 1985-10-01 Sperry Corporation Read signal detection in ternary 3PM magnetic recording
US5025327A (en) * 1986-10-17 1991-06-18 Unisys Corp. Magnetic disk write precompensation method and apparatus which takes into account variations in head/disk characteristics
WO1989002643A1 (en) * 1987-09-21 1989-03-23 Unisys Corporation Write precompensation techniques for magnetic recording
US5325241A (en) * 1991-06-14 1994-06-28 Fujitsu Limited Write precompensation with frequency synthesizer
US5335118A (en) * 1992-07-22 1994-08-02 Seagate Technology, Inc. Disc drive with write precompensation using window/pulse timing measurements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256596A1 (en) * 1973-12-28 1975-07-25 Honeywell Inf Systems
US4000513A (en) * 1975-07-28 1976-12-28 Computer Peripherals, Inc. Apparatus and method for data recording with peak shift compensation
FR2420250A1 (en) * 1978-03-16 1979-10-12 Tektronix Inc CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000512A (en) * 1975-12-17 1976-12-28 Redactron Corporation Width modulated magnetic recording
US4034348A (en) * 1976-06-28 1977-07-05 Honeywell Information Systems, Inc. Apparatus, including delay means, for sampling and recovering data recorded by the double transition recording technique
AU3825078A (en) * 1977-10-17 1980-01-24 Sundstrand Data Control Servoed accelerometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256596A1 (en) * 1973-12-28 1975-07-25 Honeywell Inf Systems
US4000513A (en) * 1975-07-28 1976-12-28 Computer Peripherals, Inc. Apparatus and method for data recording with peak shift compensation
FR2420250A1 (en) * 1978-03-16 1979-10-12 Tektronix Inc CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 13, no. 6, novembre 1970, NEW YORK (US) *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 16, no. 5, octobre 1973, NEW YORK (US) *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 17, no. 1, juin 1974, NEW YORK (US) *

Also Published As

Publication number Publication date
AU546005B2 (en) 1985-08-08
CA1172767A (en) 1984-08-14
DE3018027C2 (en) 1987-02-19
FR2456977B1 (en) 1987-03-20
AU5831780A (en) 1980-11-20
JPH0248991B2 (en) 1990-10-26
DE3018027A1 (en) 1980-11-27
US4245263A (en) 1981-01-13
GB2049369B (en) 1983-06-15
JPS55153115A (en) 1980-11-28
GB2049369A (en) 1980-12-17

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Legal Events

Date Code Title Description
ST Notification of lapse
AR Application made for restoration
CD Change of name or company name
BR Restoration of rights
ST Notification of lapse